Thank u.

Plse help as I don’t get the same answer using the excess shortage formulas vs doing this using multiple:


Mr lim has some pencils. If he ties them in bundles of 6 he will have 5 extra pencils. If he ties them in bundles of 5 he will be short of 3. What is the smallest possible number of pencils he has?
If I use excess shortage formulae : 5+3=8, difference 6 -5=1, then 8/1=8, 8*5=40, 40-3=37 but using multiple method the answer is 17. Plse advise, tks

Need some help on this, please

Mr Lim has some pencils. If he ties them in bundles of 6 he will have 5 extra pencils. If he ties them in bundles of 5 he will be short of 3 pencils. What is the smallest possible number of pencils mr Lim has?

I am not sure why I can’t get the answer by using the shortage + excess formula to do this and why this is different to using the multiple working solution?
Formulae 5+3=8, 6-5=1, 8/1=8
8*5=40, 40-3=37 but correct answer is 17??

Are there any recommended sec1 or 2 science guide books that would be useful as I find it hard to know which ones to use as the sec schools vary as I am doing o levels in 2016? The ones I see are from MC or GLM though not sure if school notes are sufficient for lower sec? Tks

Who is the teacher in charge of swimming? How are the kids selected and what age group is this? Tks

Need some help:

Factorise a^3-b^3

Hint is (a-b)^3 and answer is (a-b)(a^2+ab+b^2)

I think:
(a-b)(a-b)(a-b) but then a^2-b^2= (a-b)(a+b)

Any good recommendation for pri1 girl birthday cake? She likes choc sponge or chocolate and wanted to get one for party? 2 kg. Tks

Need help on this?

4 children decide to weigh themselves 3 at a time. Only 4 different readings were repeatedly recorded:
99.5kg, 108.1kg, 111.7kg and 116.3kg.
Find the total mass of the heaviest and lightest child?
Ans: 74.6kg

Need some help as don’t understand why this is false?


When a ball reaches its max height, the force of gravity acting on the ball is the greatest.

Tks

Any takers on this whether there is an easier way to solve than trial and error? Tks


Is there a faster method to solve this?
Eveyday A gets 10 additional new cards. On every third day he gives 3 cards away. If A starts with 8 cards on the first day, on which day will he have exactly 180 cards?

Thank you.